gruff

Gruff Graphs is a library for making beautiful graphs.

gruff gem is the Gruff graphing library for Ruby

Installation

HairTrigger

HairTrigger lets you create and manage database triggers in a concise, db-agnostic, Rails-y way. You declare triggers right in your models in Ruby, and a simple rake task does all the dirty work for you.

nip.io - Dead simple wildcard DNS for any IP Address

Stop editing your /etc/hosts file with custom hostname and IP address mappings.

nip.io allows you to do that by mapping any IP Address to a hostname using the following formats:

UUID as Primary Key

GORM uses the field with the name ID as the table’s primary key by default. You can set the fields as primary key with UUID through PostgreSQL’s uuid-ossp module.

Homebrew (brew) FAQs

The Missing Package Manager for macOS (or Linux)

FAQs - cert-manager

Error: listen tcp :10250: bind: address already in use on Alibaba Cloud Serverless Kuberneters (ASK)

Encountered an error Back-off restarting failed container when deploying cert-manager-webhook on Alibaba Cloud Serverless Kuberneters (ASK)

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shell@Alicloud:~$ kubectl logs -f cert-manager-webhook-7d6d4c78bc-lr9zh -n cert-manager
W0603 09:48:28.403062       1 client_config.go:608] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
W0603 09:48:28.404700       1 client_config.go:608] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
I0603 09:48:28.404863       1 webhook.go:69] cert-manager/webhook "msg"="using dynamic certificate generating using CA stored in Secret resource"  "secret_name"="cert-manager-webhook-ca" "secret_namespace"="cert-manager"
I0603 09:48:28.405047       1 server.go:148] cert-manager/webhook "msg"="listening for insecure healthz connections"  "address"=":6080"
Error: listen tcp :10250: bind: address already in use
...

E0603 09:48:28.405712       1 main.go:38] cert-manager "msg"="error executing command" "error"="listen tcp :10250: bind: address already in use"

Maybe ASK uses a single working node by default, which make it easy to port conflicts.

We can change 10250 to another port to avoid port conflicts。

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# values.yaml

webhook:

  # The port that the webhook should listen on for requests.
  # In GKE private clusters, by default kubernetes apiservers are allowed to
  # talk to the cluster nodes only on 443 and 10250. so configuring
  # securePort: 10250, will work out of the box without needing to add firewall
  # rules or requiring NET_BIND_SERVICE capabilities to bind port numbers <1000
  # securePort: 10250
  securePort: 10251 # change 10250 to another port.

References

[1] cert-manager/values.yaml at master · jetstack/cert-manager - https://github.com/jetstack/cert-manager/blob/master/deploy/charts/cert-manager/values.yaml

[2] Create an ASK cluster - User Guide for Serverless Kubernetes Clusters| Alibaba Cloud Documentation Center - https://www.alibabacloud.com/help/doc-detail/86377.htm

macFUSE

macFUSE allows you to extend macOS’s native file handling capabilities via third-party file systems.

GNU Wget

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SSHFS

SSHFS allows you to mount a remote filesystem using SFTP. Most SSH servers support and enable this SFTP access by default, so SSHFS is very simple to use - there’s nothing to do on the server-side.

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